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Borrowings - Additional Information (Detail)
3 Months Ended
Mar. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Trust
Dec. 31, 2015
Debt Instrument [Line Items]      
Credit available with FHLB   $ 5,500,000,000  
Credit with FHLB used   $ 1,500,000,000  
Federal Home Loan Bank advances are scheduled to mature periodically through the year   2021  
Number of unconsolidated subsidiary trusts | Trust   2  
Percent of the common equity of each Trust owned by the Corporation   100.00%  
Minimum [Member]      
Debt Instrument [Line Items]      
Effective interest rates   0.76% 0.76%
Maximum [Member]      
Debt Instrument [Line Items]      
Effective interest rates   4.19% 4.19%
Omega Financial Capital Trust I [Member]      
Debt Instrument [Line Items]      
Redemption of Corporation Issued TPS $ 10,000,000